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Abstract
The broad physics reach of the LUX-ZEPLIN (LZ) experiment covers rare phenomena beyond the direct detection of dark matter. We report precise measurements of the extremely rare decay of 124Xe through the process of two-neutrino double electron capture, utilizing a 1.39 kg × yr isotopic exposure from the first LZ science run. A half-life of T12/n22EC = (1.09 ± 0.14 stat ± 0.05sys ) × 1022 yr is observed with a statistical significance of 8.3σ, in agreement with literature. First empirical measurements of the KK capture fraction relative to other K-shell modes were conducted, and demonstrate consistency with respect to recent signal models at the 1.4σ level.
Original language | English |
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Article number | 015103 |
Pages (from-to) | 1-14 |
Number of pages | 14 |
Journal | Journal of Physics G: Nuclear and Particle Physics |
Volume | 52 |
Issue number | 1 |
DOIs | |
Publication status | Published - 6 Dec 2024 |
Keywords / Materials (for Non-textual outputs)
- dark matter detectors
- double electron capture
- nuclear decays
- rare decays
- time projection chambers
- xenon detectors
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Dive into the research topics of 'Two-neutrino double electron capture of 124Xe in the first LUX-ZEPLIN exposure'. Together they form a unique fingerprint.Projects
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Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/10/22 → 31/03/26
Project: Research